diff --git a/patches/219878.patch b/patches/219878.patch
new file mode 100644
index 00000000..ea0e9ff7
--- /dev/null
+++ b/patches/219878.patch
@@ -0,0 +1,126 @@
+From 6e060c01b8a5e85ccfc5dadaef9ffe5a1332f1ab Mon Sep 17 00:00:00 2001
+From: Charlotte Van Petegem <charlotte@vanpetegem.me>
+Date: Mon, 6 Mar 2023 21:30:06 +0100
+Subject: [PATCH] matrix-appservice-slack: 2.0.2 -> 2.1.0
+
+https://github.com/matrix-org/matrix-appservice-slack/releases/tag/2.1.0
+---
+ .../matrix-appservice-slack/package.json      | 32 +++++++++++++++----
+ .../matrix-appservice-slack/pin.json          |  6 ++--
+ .../matrix-appservice-slack/update.sh         |  2 +-
+ 3 files changed, 29 insertions(+), 11 deletions(-)
+
+diff --git a/pkgs/servers/matrix-synapse/matrix-appservice-slack/package.json b/pkgs/servers/matrix-synapse/matrix-appservice-slack/package.json
+index e52f1221327c5..dd5c93989c8dd 100644
+--- a/pkgs/servers/matrix-synapse/matrix-appservice-slack/package.json
++++ b/pkgs/servers/matrix-synapse/matrix-appservice-slack/package.json
+@@ -1,6 +1,6 @@
+ {
+   "name": "matrix-appservice-slack",
+-  "version": "2.0.2",
++  "version": "2.1.0",
+   "description": "A Matrix <--> Slack bridge",
+   "engines": {
+     "node": ">=16 <=18"
+@@ -9,12 +9,14 @@
+   "scripts": {
+     "prepare": "yarn build",
+     "start": "node ./lib/app.js",
+-    "build": "tsc --build",
++    "build": "yarn build:app && yarn build:widget",
++    "build:app": "tsc --build",
++    "build:widget": "vite build --config widget/vite.config.ts",
+     "test": "yarn test:unit && yarn test:integration",
+     "test:unit": "mocha --require ts-node/register --recursive tests/unit/*.ts",
+     "test:integration": "mocha --exit --reporter list --ui bdd --require ts-node/register --recursive tests/integration/*.ts",
+     "test:postgres": "SLACKBRIDGE_TEST_ENABLEPG=yes mocha --reporter list --ui bdd --require ts-node/register --recursive tests/integration/PgDatastoreTest.ts",
+-    "lint": "eslint -c .eslintrc.js ./src"
++    "lint": "eslint -c .eslintrc.js ./src && eslint -c ./widget/.eslintrc.js 'widget/src/**/*.{ts,tsx}'"
+   },
+   "repository": {
+     "type": "git",
+@@ -36,9 +38,12 @@
+     "@slack/rtm-api": "^6.0.0",
+     "@slack/web-api": "^6.7.2",
+     "Slackdown": "git+https://Half-Shot@github.com/half-shot/slackdown.git",
++    "ajv": "^8.12.0",
+     "axios": "^0.27.2",
++    "classnames": "^2.3.2",
+     "escape-string-regexp": "^4.0.0",
+-    "matrix-appservice-bridge": "^6.0.0",
++    "matrix-appservice-bridge": "^8.1.0",
++    "matrix-widget-api": "^1.1.1",
+     "minimist": "^1.2.6",
+     "nedb": "^1.8.0",
+     "node-emoji": "^1.10.0",
+@@ -46,10 +51,14 @@
+     "p-queue": "^6.0.0",
+     "pg-promise": "^10.11.1",
+     "randomstring": "^1.2.1",
++    "react": "^18.2.0",
++    "react-dom": "^18.2.0",
++    "url-join": "^5.0.0",
+     "uuid": "^8.3.2",
+     "yargs": "17.5.1"
+   },
+   "devDependencies": {
++    "@tailwindcss/forms": "^0.5.3",
+     "@tsconfig/node16": "^1.0.3",
+     "@types/chai": "^4.2.21",
+     "@types/js-yaml": "^4.0.2",
+@@ -59,19 +68,28 @@
+     "@types/node-emoji": "^1.8.1",
+     "@types/nunjucks": "^3.1.5",
+     "@types/randomstring": "^1.1.7",
++    "@types/react": "^18.0.27",
++    "@types/react-dom": "^18.0.10",
+     "@types/uuid": "^8.3.1",
+     "@types/yargs": "17.0.10",
+-    "@typescript-eslint/eslint-plugin": "^5.31.0",
+-    "@typescript-eslint/parser": "^5.31.0",
++    "@typescript-eslint/eslint-plugin": "^5.0.0",
++    "@typescript-eslint/parser": "^5.50.0",
++    "@vitejs/plugin-react": "^3.1.0",
++    "autoprefixer": "^10.4.13",
+     "chai": "^4.3.4",
+     "eslint": "^8.20.0",
+     "eslint-plugin-jsdoc": "^39.3.3",
+     "eslint-plugin-prefer-arrow": "^1.2.3",
++    "eslint-plugin-react": "^7.32.2",
++    "eslint-plugin-react-hooks": "^4.6.0",
+     "js-yaml": "^4.1.0",
+     "mocha": "^10.0.0",
++    "postcss": "^8.4.21",
+     "prom-client": "^14.0.1",
+     "source-map-support": "^0.5.19",
++    "tailwindcss": "^3.2.4",
+     "ts-node": "^10.1.0",
+-    "typescript": "^4.4.3"
++    "typescript": "^4.4.3",
++    "vite": "^4.1.1"
+   }
+ }
+diff --git a/pkgs/servers/matrix-synapse/matrix-appservice-slack/pin.json b/pkgs/servers/matrix-synapse/matrix-appservice-slack/pin.json
+index f842fda7ba5f4..06d4e4b142665 100644
+--- a/pkgs/servers/matrix-synapse/matrix-appservice-slack/pin.json
++++ b/pkgs/servers/matrix-synapse/matrix-appservice-slack/pin.json
+@@ -1,5 +1,5 @@
+ {
+-  "version": "2.0.2",
+-  "srcHash": "Z8PQuAOQbQMxmso/KV9n8fu2FqzqLsADqLczmm584QQ=",
+-  "yarnHash": "1ngmgr9li7jagvzfl0jq4bxqw0q1sdqh8k9wlar6q292263g287z"
++  "version": "2.1.0",
++  "srcHash": "qAmbW/aDeBWTi1czQtrsb6d5TEYw9gYJ4lpJbaX9nb0=",
++  "yarnHash": "1r5fqw7y8fzgjnl5xlr8djfmmkm8kqw5p3w12ffll6irwz90wajx"
+ }
+diff --git a/pkgs/servers/matrix-synapse/matrix-appservice-slack/update.sh b/pkgs/servers/matrix-synapse/matrix-appservice-slack/update.sh
+index 647daae22144d..92494a3c8bebf 100755
+--- a/pkgs/servers/matrix-synapse/matrix-appservice-slack/update.sh
++++ b/pkgs/servers/matrix-synapse/matrix-appservice-slack/update.sh
+@@ -1,5 +1,5 @@
+ #!/usr/bin/env nix-shell
+-#!nix-shell -I nixpkgs=../../../../ -i bash -p nix curl jq prefetch-yarn-deps nix-prefetch-github
++#!nix-shell -I nixpkgs=../../../../ -i bash -p nix curl jq prefetch-yarn-deps nix-prefetch-github nix-prefetch-git
+ 
+ if [ "$#" -gt 1 ] || [[ "$1" == -* ]]; then
+   echo "Regenerates packaging data for matrix-appservice-slack."